What would you do?

What would you do if you weren't okay with your partner watching porn, but they weren't okay with not watching it because of you? I feel like most people that watch porn have been watching it way before they were in a relationship, and if they got in a relationship and their partner wasn't okay with it, that might be an issue for them. I know that in most relationships, either both partners are okay with it or both partners aren't. I feel like it can't be one sided, like one person isn't right for not wanting to watch porn, and the other isn't wrong for wanting to continue watching porn. Or vice versa. I think it's not something that just one person decides for the relationship, it's a decision for both of you. So what would you do if you weren't okay with you're partner watching porn, but they still wanted to? Or, what would you do if your partner was not okay with you watching porn, but you still wanted to??